NOTIFIER CPU2-640 — the central processing unit for an NFS2-640 system, with an integral 3.0 A (6.0 A in alarm) power supply.
The CPU2-640 includes the control panel factory-mounted on a chassis, one Signaling Line Circuit expandable to two, and a documentation kit. Order one per system, or as necessary on a network system (up to 103 network nodes). Non-English versions are also available: CPU2-640-FR, CPU2-640-PO and CPU2-640-SP.
The CPU2-640 is the processing and power heart of the panel rather than a complete standalone system — a display is a separate decision. The KDM-R2 80-character backlit LCD with QWERTY keypad is required for each stand-alone 80-character display system, and on single CPU2-640 systems the optional NCA-2 Network Control Annunciator can instead serve as the primary display, connecting directly to the CPU.
Specifications
| Intelligent signaling line circuits |
1, expandable to 2 |
| Intelligent detectors |
159 per loop |
| Addressable monitor/control modules |
159 per loop |
| Programmable software zones |
99 |
| Special programming zones |
14 |
| LCD annunciators per CPU2-640 and NCA-2 |
32 (observe power) |
| ACS annunciators per CPU2-640 |
32 addresses x 64 points |
| Primary input power |
120 VAC, 50/60 Hz, 5.0 A |
| Board current draw (standby/alarm) |
0.250 A, plus 0.035 A for each NAC in use |
| Total output 24 V power |
6.0 A in alarm, shared by all internal circuits |
| Standard notification circuits |
Four, 1.5 A each |
| Resettable regulated 24 V power |
1.25 A |
| Non-resettable regulated 24 V outputs |
Two — 1.25 A and 0.50 A |
| Non-resettable 5 V power |
0.15 A |
| Battery charger range |
18 AH – 200 AH (use a separate cabinet for batteries over 26 AH) |
| Float rate |
27.6 V |
| Cabinet |
Installs in CAB-4 Series cabinets; requires BP2-4 Battery Plate |
| Operating environment |
32–120°F (0–49°C), relative humidity 93% ± 2% non-condensing at 90°F ± 3°F (32°C ± 2°C) |
| Standards |
UL 864 10th edition; UL 2610; UL 2572 (NFS2-640 version 20 or higher); ULC-S527-11 |
| UL/ULC listed |
S635 |
| FM |
Approved |
| CSFM |
7165-0028:0243 |
| FDNY |
#6212 |
| Other approvals |
City of Chicago; City and County of Denver; CCCF listed |
Installation notes
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6.0 A is a shared pool, not per-circuit headroom: the power supply has a total of 6.0 A available, shared by all internal circuits. The four NACs are 1.5 A each, which sums past the supply — see the Installation Manual for the current draw calculation sheet.
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Add for each NAC in use: board current draw is 0.250 A plus 0.035 A per NAC. A KDM-R2 adds 0.100 A and a LEM-320 adds 0.100 A.
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Battery size drives the cabinet: the charger covers 18–200 AH, but batteries over 26 AH require a separate cabinet. A BP2-4 Battery Plate is required in the CAB-4.
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Line voltage is model-specific: the CPU2-640 is a 120 VAC board. For 220/240 VAC service order the CPU2-640E, which draws 2.5 A (3.0 A in alarm).
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A display is a separate order: the KDM-R2 requires two BMP-1 blank modules and a DP-DISP2 mounting plate, and occupies the top row of a cabinet.
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Network displays: on network systems of two or more fire panel nodes, one network display (NCA-2 or NCS/ONYXWorks) is required for every system, and the NCA-2 then requires a standard or High-Speed Network Communication Module.
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Auxiliary and remote station service per NFPA 72 requires the TM-4.
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Shipping weight: DN-7111:O prints two conflicting bullets for CPU2-640 shipping weight (14.3 lb and 14.55 lb), so no single figure is stated here — confirm with the manufacturer if it matters for freight.
Related models
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CPU2-640E — same CPU but requires 240 VAC, 1.5 A (3.0 A in alarm). Also available as CPU2-640E-PO and CPU2-640E-SP.
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CPU2-640-FR / -PO / -SP — French, Portuguese and Spanish versions of this board.
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KDM-R2 — 80-character backlit LCD display with QWERTY programming and control keypad.
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NCA-2 — 640-character Network Control Annunciator; can serve as the primary display on a single-CPU system.
Specifications taken from the NOTIFIER data sheet "NFS2-640 Intelligent Addressable Fire Alarm Control Panel," document DN-7111:O (9/14/2022). Manufacturer specifications are subject to change without notice.
